Patents by Inventor Chang-Da Tsai

Chang-Da Tsai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11233173
    Abstract: An ultraviolet C light-emitting diode including an n-type semiconductor layer, a p-type semiconductor layer, an active layer, a two-dimensional hole gas (2DHG) inducing layer, and an electron blocking layer is provided. The active layer is disposed between the n-type semiconductor layer and the p-type semiconductor layer, wherein a wavelength of a maximum peak of a spectrum emitted by the active layer ranges from 230 nm to 280 nm. The two-dimensional hole gas (2DHG) inducing layer is disposed between the active layer and the p-type semiconductor layer. A concentration of magnesium in the 2DHG inducing layer is less than 1017 atoms/cm3. The electron blocking layer is disposed between the p-type semiconductor layer and the 2DHG inducing layer. A concentration of magnesium in a part of the electron blocking layer adjacent to the 2DHG inducing layer is greater than 1019 atoms/cm3.
    Type: Grant
    Filed: August 31, 2020
    Date of Patent: January 25, 2022
    Assignees: Industrial Technology Research Institute, OPTO TECH CORP.
    Inventors: Chia-Lung Tsai, Hsueh-Hsing Liu, Chang Da Tsai
  • Publication number: 20210111310
    Abstract: A light emitting chip and associated package structure are provided. The light emitting chip includes a substrate, a first type layer, an active layer, a second type layer, a first type electrode and a second type electrode. A second portion of the first type layer is located over the substrate. A first portion of the first type layer is located over the second portion of the first type layer. The active layer is located over the first portion of the first type layer. The second type layer is located over the active layer. The first type electrode is contacted with a top surface and a sidewall of the second portion of the first type layer and contacted with a portion of a sidewall of the substrate. The second type electrode is contacted with the second type layer.
    Type: Application
    Filed: November 30, 2020
    Publication date: April 15, 2021
    Inventors: Chang-Da TSAI, Wei-Che WU, Kuan-Kai HUANG
  • Publication number: 20210005778
    Abstract: A composite substrate including a substrate, a buffer layer, and a strain release layer. The buffer layer is disposed on the substrate is provided. The strain release layer is disposed on the buffer layer, wherein the buffer layer is between the substrate and the strain release layer. A material of the strain release layer includes Al1-xGaxN, where 0?x<0.15. The strain release layer is doped with silicon to release a compressive strain due to the buffer layer. A concentration of silicon doped in the strain release layer is greater than 1019 cm?3. A defect density of the strain release layer is less than or equal to 5×109/cm2. A light-emitting diode is also provided.
    Type: Application
    Filed: August 31, 2020
    Publication date: January 7, 2021
    Applicants: Industrial Technology Research Institute, OPTO TECH CORP.
    Inventors: Chia-Yen Huang, Chang Da Tsai
  • Publication number: 20210005780
    Abstract: An ultraviolet C light-emitting diode including an n-type semiconductor layer, a p-type semiconductor layer, an active layer, a two-dimensional hole gas (2DHG) inducing layer, and an electron blocking layer is provided. The active layer is disposed between the n-type semiconductor layer and the p-type semiconductor layer, wherein a wavelength of a maximum peak of a spectrum emitted by the active layer ranges from 230 nm to 280 nm. The two-dimensional hole gas (2DHG) inducing layer is disposed between the active layer and the p-type semiconductor layer. A concentration of magnesium in the 2DHG inducing layer is less than 1017 atoms/cm3. The electron blocking layer is disposed between the p-type semiconductor layer and the 2DHG inducing layer. A concentration of magnesium in a part of the electron blocking layer adjacent to the 2DHG inducing layer is greater than 1019 atoms/cm3.
    Type: Application
    Filed: August 31, 2020
    Publication date: January 7, 2021
    Applicants: Industrial Technology Research Institute, OPTO TECH CORP.
    Inventors: Chia-Lung Tsai, Hsueh-Hsing Liu, Chang Da Tsai
  • Publication number: 20190355888
    Abstract: A light emitting chip and associated package structure are provided. The light emitting chip includes a substrate, a first type layer, an active layer, a second type layer, a first type electrode and a second type electrode. A second portion of the first type layer is located over the substrate. A first portion of the first type layer is located over the second portion of the first type layer. The active layer is located over the first portion of the first type layer. The second type layer is located over the active layer. The first type electrode is contacted with a sidewall of the second portion of the first type layer and contacted with a sidewall of the substrate. The second type electrode is contacted with the second type layer.
    Type: Application
    Filed: December 17, 2018
    Publication date: November 21, 2019
    Inventors: Chang-Da TSAI, Wei-Che WU, Kuan-Kai HUANG
  • Publication number: 20170314131
    Abstract: The present invention relates to a gas distributing injector applied in MOCVD reactor. The gas distributing injector comprises at least one gas distributing layer for distributing different gases. The distributing layer is a single-layered structure. The distributing layer comprises a disk-shaped body, a plurality of first gas channels, a plurality of second gas channels, and a plurality of third gas channels. The first gas channels, the second gas channels, and the third gas channels are radially distributed on the same plane in the disk-shaped body. Different gases are distributed or fed into different gas channels (such as the first gas channels, the second gas channels, and the third gas channels) and transported by different gas channels. Through different gas channels, different gases are transversely injected into the MOCVD reactor on the same plane respectively. Therefore, the gas distributing injector of this invention can distribute different gases by a single-layered structure.
    Type: Application
    Filed: March 23, 2017
    Publication date: November 2, 2017
    Inventors: Po-Jung Lin, Che-Lin Chen, Chang-Da Tsai, Bu-Chin Chung
  • Patent number: 8592234
    Abstract: A light emitting diode comprises a permanent substrate having a chip holding space formed on a first surface of the permanent substrate; an insulating layer and a metal layer sequentially formed on the first surface of the permanent substrate and the chip holding space, wherein the metal layer comprises a first area and a second area not being contacted to each other; a chip having a first surface attached on a bottom of the chip holding space, contacted to the first area of the metal layer; a filler structure filled between the chip holding space and the chip; and a first electrode formed on a second surface of the chip. The chip comprises a light-emitting region and an electrical connection between the first area of the metal layer and the light emitting region is realized by using a chip-bonding technology.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: November 26, 2013
    Assignee: Opto Tech Corporation
    Inventors: Chang-Da Tsai, Wei-Che Wu, Chia-Liang Hsu, Ching-Shih Ma
  • Publication number: 20120322180
    Abstract: A light emitting diode comprises a permanent substrate having a chip holding space formed on a first surface of the permanent substrate; an insulating layer and a metal layer sequentially formed on the first surface of the permanent substrate and the chip holding space, wherein the metal layer comprises a first area and a second area not being contacted to each other; a chip having a first surface attached on a bottom of the chip holding space, contacted to the first area of the metal layer; a filler structure filled between the chip holding space and the chip; and a first electrode formed on a second surface of the chip. The chip comprises a light-emitting region and an electrical connection between the first area of the metal layer and the light emitting region is realized by using a chip-bonding technology.
    Type: Application
    Filed: August 27, 2012
    Publication date: December 20, 2012
    Applicant: OPTO TECH CORPORATION
    Inventors: Chang-Da Tsai, Wei-Che Wu, Chia-Liang Hsu, Ching-Shih Ma
  • Patent number: 8283683
    Abstract: A light emitting diode chip includes a permanent substrate having a holding space formed on the permanent substrate; an insulating layer and a metal layer sequentially formed on the permanent substrate and the holding spacer; a die having a eutectic layer and a light-emitting region and bonded to the metal layer within the holding space via the eutectic layer coupling to the metal layer; a filler structure filled between the holding space and the die; and an electrode formed on the die and in contact with the light-emitting region.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: October 9, 2012
    Assignee: Opto Tech Corporation
    Inventors: Chang-Da Tsai, Wei-Che Wu, Chia-Liang Hsu, Ching-Shih Ma
  • Publication number: 20100072497
    Abstract: A light emitting diode chip includes a permanent substrate having a holding space formed on the permanent substrate; an insulating layer and a metal layer sequentially formed on the permanent substrate and the holding spacer; a die having a eutectic layer and a light-emitting region and bonded to the metal layer within the holding space via the eutectic layer coupling to the metal layer; a filler structure filled between the holding space and the die; and an electrode formed on the die and in contact with the light-emitting region.
    Type: Application
    Filed: December 1, 2009
    Publication date: March 25, 2010
    Applicant: OPTO TECH CORPORATION
    Inventors: Chang-Da Tsai, Wei-Che Wu, Chia-Liang Hsu, Ching-Shih Ma
  • Publication number: 20080105863
    Abstract: A light emitting diode comprises a permanent substrate having a chip holding space formed on a first surface of the permanent substrate; an insulating layer and a metal layer sequentially formed on the first surface of the permanent substrate and the chip holding space, wherein the metal layer further comprises a first area and a second area not being contacted to each other; a chip having a first surface attached on a bottom of the chip holding space, contacted to the first area of the metal layer but not contacted to the second area of the metal layer; a filler structure filled between the chip holding space and the chip; and a first electrode formed on a second surface of the chip. The chip comprises a light-emitting region and an electrical connection between the first area of the metal layer and the light emitting region is realized by using a chip-bonding technology.
    Type: Application
    Filed: May 15, 2007
    Publication date: May 8, 2008
    Applicant: OPTO TECH CORPORATION
    Inventors: Chang-Da Tsai, Wei-Che Wu, Chia-Liang Hsu
  • Publication number: 20070290221
    Abstract: A light emitting diode includes a permanent substrate having a first portion and a second portion, and a chip attached on the first portion of the permanent substrate by a chip bonding technology. The chip includes at least one first electrode and a light emitting region. The manufacturing method comprises a step of mounting a single chip on the first portion of the permanent substrate by a chip bonding technology to overcome the fragility problem of an EPI-wafer.
    Type: Application
    Filed: May 15, 2007
    Publication date: December 20, 2007
    Applicant: OPTO TECH CORPORATION
    Inventors: Chang-Da Tsai, Ching-Shih Ma
  • Patent number: 6903381
    Abstract: The present invention discloses a light-emitting diode and a method for manufacturing such a light-emitting diode with a direct band-gap III-V compound semiconductor material on a GaAs substrate. It is implemented by forming a first conductive electrode on the top edge of the epitaxial LED layer and a second conductive electrode opposite the first conductive electrode on the edge of a transparent substrate. Further, after the first conductive electrode and second conductive electrode are connected by chip bonding skill, it is selectively to remove the GaAs substrate and plate a transparent electrode on the top portion of the epitaxial LED layer. Therefore, when casting from P-N junction of the light-emitting diode, the light will go through with directions of the top portion of epitaxial layer and transparent substrate.
    Type: Grant
    Filed: April 24, 2003
    Date of Patent: June 7, 2005
    Assignee: Opto Tech Corporation
    Inventors: Ming-Der Lin, Chang-Da Tsai
  • Publication number: 20040211968
    Abstract: The present invention discloses a light-emitting diode and a method for manufacturing such a light-emitting diode with a direct band-gap III-V compound semiconductor material on a GaAs substrate. It is implemented by forming a first conductive electrode on the top edge of the epitaxial LED layer and a second conductive electrode opposite the first conductive electrode on the edge of a transparent substrate. Further, after the first conductive electrode and second conductive electrode are connected by chip bonding skill, it is selectively to remove the GaAs substrate and plate a transparent electrode on the top portion of the epitaxial LED layer. Therefore, when casting from P-N junction of the light-emitting diode, the light will go through with directions of the top portion of epitaxial layer and transparent substrate.
    Type: Application
    Filed: April 24, 2003
    Publication date: October 28, 2004
    Inventors: Ming-Der Lin, Chang-Da Tsai
  • Patent number: 6809341
    Abstract: A light-emitting diode with enhanced brightness and a method for fabricating the diode is provided. The light-emitting diode includes an epitaxial LED structure having at least one lighting-emitting active layer with a plurality of windows formed in a highly doped layer. At least one conductive contact is formed on the bottom surface of the highly doped layer. A transparent material layer is formed in the windows. An adhesion layer is formed between the transparent material layer and a permanent substrate. A bottom electrode is formed on the bottom surface of the permanent substrate and an opposed electrode is formed on the top surface of the epitaxial LED structure.
    Type: Grant
    Filed: March 11, 2003
    Date of Patent: October 26, 2004
    Assignee: Opto Tech University
    Inventors: Jung-Kuei Hsu, Hsueh-Chih Yu, Hung-Yuan Lu, Chui-Chuan Chang, Kwang-Ru Wang, Chang-Da Tsai, San Bao Lin, Yung-Chiang Hwang, Ming-Der Lin
  • Publication number: 20040178415
    Abstract: The present invention discloses a light-emitting diode with enhanced brightness and a method for fabricating the same. The light-emitting diode comprises: an epitaxial LED structure having at least one lighting-emitting active layer with a plurality of spacers inside the lighting-emitting active layer; at least one conductive contact, formed on the bottom surface where no spacer is formed inside the lighting-emitting active layer; a transparent material layer formed in the spacers; an adhesion layer formed between the transparent material layer and a permanent substrate; a bottom electrode formed on the bottom surface of the permanent substrate; and an opposed electrode formed on the top surface of the epitaxial LED structure.
    Type: Application
    Filed: March 11, 2003
    Publication date: September 16, 2004
    Inventors: Jung-Kuei Hsu, Hsueh-Chih Yu, Hung-Yuan Lu, Yen-Hu Chu, Chui-Chuan Chang, Kwang-Ru Wang, Chang-Da Tsai, San Bao Lin, Yung-Chiang Hwang, Ming-Der Lin
  • Patent number: 6716654
    Abstract: The present invention discloses a light-emitting diode with enhanced brightness and a method for fabricating the same. The light-emitting diode comprises: an epitaxial LED structure having at least one lighting-emitting active layer with a plurality of spacers inside the lighting-emitting active layer; at least one conductive contact, formed on the bottom surface where no spacer is formed inside the lighting-emitting active layer; a transparent material layer formed in the spacers; an adhesion layer formed between the transparent material layer and a permanent substrate; a bottom electrode formed on the bottom surface of the permanent substrate; and an opposed electrode formed on the top surface of the epitaxial LED structure.
    Type: Grant
    Filed: March 12, 2002
    Date of Patent: April 6, 2004
    Assignee: Opto Tech Corporation
    Inventors: Jung-Kuei Hsu, Hsueh-Chih Yu, Chia-Liang Hsu, Hung-Yuan Lu, Yen-Hu Chu, Chui-Chuan Chang, Kwang-Ru Wang, Chang-Da Tsai, San Bao Lin, Yung-Chiang Hwang, Ming-Der Lin
  • Patent number: 6717711
    Abstract: A forming method and a structure of a high efficiency electro-optics device are disclosed. In the present invention, the cell-fixing surface between the die carrier and the electro-optics cell is decreased to increase the light emitting and absorbing regions of the electro-optics device. Thus, the operating efficiency and the sensitivity of the electro-optics device is increased substantially. Especially, the present invention has the advantage of fully showing the efficacy of device using the transparent substrate. Furthermore, when the electro-optics cell is fixing on the cell-fixing surface by utilizing the eutectic or metal-melting bonding method, a result of self-alignment can be achieved. Thus, the accuracy of the packaging device is increased substantially, thereby reducing the loss caused by the failure of poor cell-fixing while in mass production and meanwhile increasing the accuracy of fixing cell. Therefore, the present technology is quite suitable for use in the packaging of high precision.
    Type: Grant
    Filed: February 11, 2002
    Date of Patent: April 6, 2004
    Assignee: Opto Tech Corporation
    Inventors: Ming-Der Lin, Kwang-Ru Wang, Chang-Da Tsai, Jung-Kuei Hsu
  • Patent number: 6686218
    Abstract: A method for packaging an electro-optics device is disclosed. A transparent material is added between the die carrier and the electro-optics device, so that the light emitted from the backside of the electro-optics device can be extracted. Furthermore, a light reflective layer is formed on the die carrier, and a pattern of the light reflective layer is designed to prevent the light from being reflected to the active layer, the reflecting decreasing light-emitting efficiency again.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: February 3, 2004
    Assignee: Opto Tech Corporation
    Inventors: Ming-Der Lin, Chang-Da Tsai, Kwang-Ru Wang, Ching-Liang Kao, Wen-Liang Tseng, Chia-Chen Chang
  • Publication number: 20030173602
    Abstract: The present invention discloses a light-emitting diode with enhanced brightness and a method for fabricating the same. The light-emitting diode comprises: an epitaxial LED structure having at least one lighting-emitting active layer with a plurality of spacers inside the lighting-emitting active layer; at least one conductive contact, formed on the bottom surface where no spacer is formed inside the lighting-emitting active layer; a transparent material layer formed in the spacers; an adhesion layer formed between the transparent material layer and a permanent substrate; a bottom electrode formed on the bottom surface of the permanent substrate; and an opposed electrode formed on the top surface of the epitaxial LED structure.
    Type: Application
    Filed: March 12, 2002
    Publication date: September 18, 2003
    Inventors: Jung-Kuei Hsu, Hsueh-Chih Yu, Chia-Liang Hsu, Hung-Yuan Lu, Yen-Hu Chu, Chui-Chuan Chang, Kwang-Ru Wang, Chang-Da Tsai, San Bao Lin, Yung-Chiang Hwang, Ming-Der Lin